July 11-15, 2011
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CoRoT observations of O stars: diverse origins of variability

Ronny Blomme (Royal Observatory of Belgium)

M. Briquet, P. Degroote, L. Mahy, C. Aerts, J. Cuypers, M. Godart, E. Gosset, M. Hareter, J. Montalban, T. Morel, M.F. Nieva, A. Noels, R. Oreiro, E. Poretti, N. Przybilla, M. Rainer, G. Rauw, F. Schiller, S. Simon-Diaz, K. Smolders, P. Ventura, M. Vuckovic, M. Auvergne, A. Baglin, F. Baudin, C. Catala, E. Michel, R. Samadi

Six O-type stars were observed continuously by the CoRoT satellite during a 34.3-day run. The unprecedented quality of the data allows us to detect even low-amplitude stellar pulsations in some of these stars (HD 46202 and the binaries HD 46149 and Plaskett's star). These cover both opacity-driven modes and solar-like stochastic oscillations, both of importance to the asteroseismological modelling of O stars. Additional effects can be seen in the CoRoT lightcurves, such as binarity and rotational modulation. The hottest O-type stars (HD 46223, HD 46150 and HD 46966) are dominated by the presence of red-noise: we speculate that this is related to a sub-surface convection zone.
(to be confirmed by the SOC)